Hello MYCUBE PC,
You can use Photoshop (tool for image editing), if you don't have that software you can do it online as well from pixlr.com/editor/ here.
Still if you are not getting success then let me know for that I will do size changes on your logo, do you have AI or PSD file of the logo with you?
Thanks.
Regards,
Yuvraj Jain.
